Welcome to FT.

Transferring to United should be almost immediate, so there's definitely something wrong here. Are you a Chase Sapphire Preferred member? If so, try calling the number in the back of your card (if you haven't done so already) to see if you can escalate it again. CSP reps should be helpful from what I read here. Didn't need to call them up yet so I can't vouch for it myself.